Auto-Generate Trailers: Best Spoken Moments or Even Intervals

When you run Generate Shorts, you can also create a trailer — a compact highlight reel that previews the best moments from your long video. The trailer is generated as a separate project alongside the individual Shorts, ready to export and use as a channel trailer, episode preview, or social media teaser.

You choose between two modes: AI mode, where the AI selects the most compelling spoken moments from the transcript, and Manual mode, where fragments are taken at even intervals across the full video.

Enabling Trailer Generation

1

Open the Generate Shorts wizard

Import a long video, tap the AI button, and select Generate Shorts. Before starting the process, you will see the configuration screen.

2

Toggle "Create Trailer"

On the configuration screen, enable the Create Trailer switch. Additional trailer settings appear below it.

3

Choose a mode and set the target duration

Select AI or Manual mode and set your preferred trailer length (details below). Then start the process as usual — the trailer is generated alongside your Shorts.

4

Find your trailer in the project list

When processing finishes, a trailer project appears in the project list alongside the generated Shorts. Open it to review, trim, add music, style subtitles, or export.

AI Mode

AI mode analyzes the full transcript and picks the segments with the strongest standalone impact — moments that grab attention out of context. These are typically punchy statements, surprising facts, emotional peaks, or clear takeaways. The AI arranges them into a sequence that flows naturally as a highlight reel.

This mode works best when your video has strong spoken content — podcasts, interviews, presentations, or any video where certain moments are significantly more compelling than others.

AI picks best moments from speech. The selection is based on what is said, not how the video looks. Videos with clear, impactful spoken moments produce the best AI trailers.

Manual Mode

Manual mode takes fragments at evenly spaced intervals across the full video, giving a broad preview of the entire content. Instead of analyzing the transcript for highlights, it divides the timeline into equal sections and extracts a short clip from each.

Manual mode has an additional setting: Fragment Length, which controls how long each individual fragment is (from 3 to 15 seconds, in 1-second steps). Shorter fragments create a faster, more dynamic trailer. Longer fragments give viewers more context for each moment.

This mode works well for visually driven content — travel videos, event recaps, tutorials, or any video where you want to show the full scope rather than cherry-pick specific moments.

Setting the Target Duration

Both modes let you set a target trailer duration between 15 and 180 seconds (in 15-second steps). The actual trailer length will be close to but may not exactly match the target, depending on how segments align with natural speech boundaries (AI mode) or fragment spacing (Manual mode).

Some guidelines for choosing a duration:

  • 15-30 seconds — short teaser for social media stories or ads
  • 30-60 seconds — standard trailer for YouTube, channel previews
  • 60-120 seconds — extended preview for longer content like courses or conferences
  • 120-180 seconds — detailed overview, almost a condensed version of the full video
Source video length matters. The trailer duration should be significantly shorter than the source video. Requesting a 3-minute trailer from a 5-minute video will not produce meaningful compression — aim for a trailer that is at most 20-30% of the source length.

What You Get

The trailer is created as a full Bitcut project, exactly like the individual Shorts. This means you can:

  • Edit freely — trim fragments, remove sections, reorder clips
  • Add subtitles — word-level subtitles are included if the source had speech
  • Add music — drop in a background track and enable beat sync
  • Apply face tracking — use auto-reframe for vertical output
  • Export — render in any aspect ratio, resolution, and quality preset
  • Publish — upload to cloud storage for sharing

Tips for Better Trailers

  • AI mode for speech, Manual for visuals — if your video is talk-heavy, AI mode finds the highlights. If it is visually driven with less speech, Manual mode gives a more representative preview.
  • Shorter is usually better — trailers that run under 60 seconds tend to hold viewer attention. Save longer durations for content that genuinely needs the extra time.
  • Add music after generation — a background track with beat sync can transform a collection of fragments into a polished, rhythmic trailer.
  • Trim the AI output — AI mode gives you a strong starting point, but reviewing the trailer and trimming any weak moments will always improve the result.
  • Re-generate if needed — try different durations or switch between AI and Manual mode to compare results. Each generation creates a new project, so you can keep multiple versions.